21309342169291 has 16 divisors (see below), whose sum is σ = 23276914214400. Its totient is φ = 19346846083200.

The previous prime is 21309342169277. The next prime is 21309342169303. The reversal of 21309342169291 is 19296124390312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21309342169291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21309342169201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26164915 + ... + 26967043.

It is an arithmetic number, because the mean of its divisors is an integer number (1454807138400).

Almost surely, 2^{21309342169291} is an apocalyptic number.

21309342169291 is a deficient number, since it is larger than the sum of its proper divisors (1967572045109).

21309342169291 is a wasteful number, since it uses less digits than its factorization.

21309342169291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805290.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The spelling of 21309342169291 in words is "twenty-one trillion, three hundred nine billion, three hundred forty-two million, one hundred sixty-nine thousand, two hundred ninety-one".